PBX driver for CSTA support

hi all,

Greetings.
I m doin a PBX driver for third party CSTA servers. My PBX also
connects to any third party media server.

CSTA server needs to be informed about the media server(type,
capabilites etc) attached to the PBX.

For above to happen, PBX needs to communicate with the media server and
retrieve all the capabilites which can be further forwarded to the CSTA
server requests.

1) Is there any standard mechanism(protocol) available for the
communication b/w media server and PBX ??

2) Or, rather, wht kind of support does popular available media servers
provide for such kind of information exchange ??

3) all those popular available PBX which supports several media
servers, wht kind of protocol does they follow for information
exchange.

Thanking you,

Aakash

.